We first show that the question is wrong. For, note that
since
Hence
which is true only when (since which is a contradiction) and
Thus, the equation in the quaternions has only two solutions .
Correct question: Prove that there exists an infinite quantity of solutions to in the quaternions.
Answer: From above we find that
which is true only when and hence we find that
Thus, the solution set of in the quaternions is given by
which has a bijective correspondance with the points on the unit sphere in . Hence there exists an infinite quantity of solutions to in the quaternions.
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